21701016 has 24 divisors (see below), whose sum is σ = 58773780. Its totient is φ = 7233648.

The previous prime is 21701003. The next prime is 21701039. The reversal of 21701016 is 61010712.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 21701016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 150630 + ... + 150773.

Almost surely, 2^21701016 is an apocalyptic number.

It is an amenable number.

21701016 is an abundant number, since it is smaller than the sum of its proper divisors (37072764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21701016 is a wasteful number, since it uses less digits than its factorization.

21701016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301415 (or 301408 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 21701016 is about 4658.4349303173. The cubic root of 21701016 is about 278.9287982641.

Adding to 21701016 its reverse (61010712), we get a palindrome (82711728).

The spelling of 21701016 in words is "twenty-one million, seven hundred one thousand, sixteen".